Contract Staff Front End Engineer (Web Conference/Screen Sharing)
Summary
A fixed-term contract front-end engineer implements and ships approved UX designs for Firefox's screen, window, and tab sharing features in the large mozilla-central codebase, building tested, accessible, and localizable browser UI with JavaScript, HTML, and CSS while collaborating with UX, QA, and conferencing partners via public code review.
About the team and role
Mozilla's Web Conferencing team owns the media capture and sharing features that make Firefox work for video calls: screen, window, and tab capture, and the interface users interact with when they share content in Google Meet, Zoom, or Jitsi.
We're bringing a set of screensharing improvements to Firefox. The backend work is complete and the UX has been designed and approved. We're looking for a front-end engineer on a fixed-term contract to implement it and ship it.
What you'll do
- Implement approved UX designs for Firefox's screen, window, and tab sharing experience, and see them through to release
- Build browser UI that holds up in a large, widely used codebase: tested, accessible, and localizable
- Work with UX on the cases a design didn't anticipate, and with QA on validating the result
- Support partner testing against major web conferencing services
- Land your work in mozilla-central through public code review on Phabricator
What you'll bring
- 4+ years building production user interfaces with JavaScript, HTML, and CSS
- Experience implementing an approved design faithfully, plus the judgment to flag it when the design meets a case it didn't anticipate
- Ability to get productive quickly in a large, mature codebase you didn't write
- Experience writing automated tests for user interfaces
- Strong asynchronous written communication, since the team is distributed across timezones
- Comfort working in public, since Bugzilla and Phabricator are open
Bonus qualifications
- Prior contributions to Firefox or another open-source browser
- Familiarity with Firefox front-end architecture: browser/, custom elements, XUL, Fluent localization
- Experience with WebRTC or getDisplayMedia
- Accessibility experience with modal dialogs and list navigation
- Experience with Mozilla's test frameworks (browser-chrome, mochitest)
- Experience using AI tooling effectively in front-end development
- Open source environment experience
Hiring Ranges:
Skills
As published by greenhouse · 8 questions · 2 written answers
Basics
First Name, Last Name, Email, Phone, Resume/CV, Cover Letter, Location
Short answers (4)
- Preferred First Name optional
- LinkedIn Profile optional
- Website optional
- What automated testing tools/frameworks (e.g., Jest, Cypress, Playwright) have you used to test user interfaces?
Pick from a list (2)
- Are you authorized to work lawfully in the country to which you are applying for Mozilla
- Do you now or in the future require sponsorship (Skip this question if you are applying to work in Canada or the UK)
Written answers (2)
- How many years of professional experience building production web interfaces with JavaScript, HTML, and CSS? Please briefly list your primary UI frameworks or tools.
- Do you have experience with screen/media sharing APIs (like WebRTC), Firefox front-end tools (Fluent, custom elements), or public open-source contributions?
